Telephone line tester



FIG. 1 is a top, front, and right side perspective view of a telephone line tester showing our new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a front elevational view;

FIG. 5 is a right side elevational view; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a telephone line tester, as shown. 